Zhang, ChenglinHarriger, Leland W.Yin, ZhipingLv, WeichengWang, MiaoyinTan, GuotaiSong, YuAbernathy, D.L.Tian, WeiEgami, TakeshiHaule, KristjanKotliar, GabrielDai, Pengcheng2017-06-052017-06-052014Zhang, Chenglin, Harriger, Leland W., Yin, Zhiping, et al.. "Effect of Pnictogen Height on Spin Waves in Iron Pnictides." <i>Physical Review Letters,</i> 112, no. 21 (2014) American Physical Society: https://doi.org/10.1103/PhysRevLett.112.217202.https://hdl.handle.net/1911/94801We use inelastic neutron scattering to study spin waves in the antiferromagnetic ordered phase of iron pnictide NaFeAs throughout the Brillouin zone. Comparing with the well-studied AFe2As2 (A=Ca, Sr, Ba) family, spin waves in NaFeAs have considerably lower zone boundary energies and more isotropic effective in-plane magnetic exchange couplings. These results are consistent with calculations from a combined density functional theory and dynamical mean field theory and provide strong evidence that pnictogen height controls the strength of electron-electron correlations and consequently the effective bandwidth of magnetic excitations.engArticle is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.Journal articlehttps://doi.org/10.1103/PhysRevLett.112.217202